Post Nominal and Pre Nominal Letters
I have found that in Malaysia the use of Titles is rife and many people seem to have multiple titles which are always mandatory to include when addressing a formal gathering. Malaysia is regarded as one of the most rigidly hierarchical societies in the world (power-distance in Hofstede's terminology).
Interestingly enough the pre-nominal 'Captain' is assigned to Commercial Pilots who have a current Flight Instructor Rating. However the First Officer of a Boeing or Airbus without an Instructor Rating would not be entitled to use that appellation.
I suspect that this may be due to the Asian deference to the Teacher (Guru or Sifu) which is seen (as in the United States) as a particulary important role in Society.
Hence assuming Heathrow Director possesses a Flight Instructor or Examiner rating I would use post nominal letters of FI (maybe CFI in the States) or FE etc.